导体的切割算法.DOC

电力系统接地网仿真计算分析系统的设计及实现马俊阳，吴在军，窦晓波，胡敏强 （东南大学电气工程学院，南京 210096）摘要：为提高接地系统仿真分析及设计的效率，提出并设计了一种以Qt库为基础的接地计算仿真分析系统，能够计算水平分层土壤情况下各种形状接地网的接地电阻，以及故障电流入地时产生的跨步电压，接触电压和地电位升高等物理量。仿真系统由相互独立的数据输入模块、仿真计算分析模块和可视化显示输出模块三部分组成，通过引入观测线、观测面及虚拟围墙的概念，使得软件具有更高的灵活性和易用性。对系统中采用的改进导体切割算法，电阻矩阵的加速算法及跨步电压的计算算法进行了分析介绍。算例分析中，对仿真系统的计算精度进行了对比校核，并对某变电站“凸”字形接地网进行了仿真计算分析，验证了分析系统的有效性和实用性。 关键词：接地网，仿真计算，软件设计，Qt，跨步电压，接触电压( 中图分类号： 文献标志码： 文章编号：1001-1390（201）00-0000-00 QtBased Software Design of the Power System Grounding Grid Simulation Calculation MA Jun-yang, WU Zai-jun, DOU Xiao-bo, HU Min-qiang (School of Electrical Engineering, Southeast University, Nanjing 210096, China) Abstract: In order to improve the efficiency in the simulation analysis and design of the grounding grid, the paper proposed and designed a Qt-based simulation analysis system of the grounding calculation, which could calculate the grounding resistance of various grounding grids in the horizontal layered soil, and such physical quantities as step voltage, touch voltage and ground potential rise generated when fault current flew under the ground. The simulation system consisted of three mutually exclusive modules: the data input module, simulation calculation analysis module and visual display output module. Introduction of the concepts such as observation line, observation surface and virtual fence made the software more feasible and useable. The paper introduced and analyzed the improved conductor cuts algorithm, resistance matrix acceleration algorithm and step voltage calculation algorithm in the system. The calculation accuracy of the simulation system was compared and checked, and the simulation calculation analysis was made on the convex-shaped grounding grid in a certain electric substation. The results verified the validity and practicability of the software. Key words：rounding grid, simulation calculation, software design, Qt, step voltage, touch voltage 0 引言 在电力系统设计与建设中，接地是关键的一个问题，良好设计的接地系统是